Find somewhere to sit, kick back and just enjoy the sound of the water hitting the shore at Plage du Redon. If you need a dose of vitamin sea, this is the place to get your fill.
You'll have sightseeing choices galore when in Margencel. Plage du Redon is a good place to begin here, but there are loads of other worthy sights to enjoy. Thermes de Thonon-les-Bains, Garden of Five Senses, and Chateau d'Yvoire are not far from the stretch of coastline and will fill in your day nicely.